Hi I want to bring a little change in my site. So i have written a set of rules but I dont know how to fire them in the place that i want them to work i.e. the original code of my site.Can anyone plz help me on it?
A little information is missing (like which Drools version, the environment you're running in, etc.), so I'll try to answer in a general way, and if you need something more specific let me know:
In general in Drools you 'assert' objects into the working memory (using methods like, well, assertObject..), this allows the rule engine to be aware of them, and later, when you execute 'fireAllRules' on that working memory, all the rules are executed (so, you explicitly call the fireAllRules method on your working memory when you want to - I think this is what you were asking).
For more detailed information, in case you haven't looked already, you can check this: http://legacy.drools.codehaus.org/Working+Memory .
thanks
Gadi
when you have your abc object, this will be the fact that you insert into the Working Memory. For example:
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory.newFileSystemResource( fileName ), ResourceType.DRL );
if (kbuilder.hasErrors() ) {
System.out.println( kbuilder.getErrors() );
} else {
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession();
ksession.execute( abc );
}
Then you will have your modified abc object when the execute finishes. Take a look at here
You probably dont't want the rules being build everytime (this is really time consumer), so you can use or KnowledgeAgent or have an static KnowledgeBase and recreate it whenever your rules files change.
Related
I know, but we really need it.
We have a clear division of labor.
They create templates, I fill them in runtime according to some rules.
Can't teach my business to insert something like this and be sure they really did it ok(so can't move any logic to templates):
$P{risk_types}.get($F{risk_type}) ?: "UNDEFINED"
Also can not fill from files hardcoded in some adapter hadwritten by god-knows-who and unchangeable in runtime. It's a web app. Best option is to find a way to replace that file source from adapter to a ByteArrayStream.
SO:
Need to substitute contents of parameters(also default ones) at runtime.
example:
need to set JSON_INPUT_STREAM
Like this unsolved thread.
https://community.jaspersoft.com/questions/516611/changing-parameter-scriptlet
Really hope not to work on xml level, but xml also can't solve my problem as far as I tried.
Thank you!
The easiest and cleanest way we did this(bypassing usage of tons of deprecated documentation and unfinished bugged undocumented static antipatterned new features):
Create context with repository extension
SimpleJasperReportsContext jasperReportsContext = new SimpleJasperReportsContext();
jasperReportsContext.setExtensions(RepositoryService.class, Collections.singletonList(new MyRepositoryService(jasperReportsContext, yourOptionalParams)));
Fill this way(after compile and other usual actions)
JasperPrint print = JasperFillManager.getInstance(jasperReportsContext).fill(compiled, new HashMap<>());
Now your repository must extend default one to be hack-injected(cause of hodgie coded "isAssignableFrom") successfully
public class PrintFormsRepositoryService extends DefaultRepositoryService {
#Override
public InputStream getInputStream(RepositoryContext context, String uri) {
// return here your own good simple poj inputStream even from memory if you found source
// or pass to another repository service(default one probably)
return null;
}
}
How do I "tell" EF to log queries globally? I was reading this blog post: EF logging which tells in general how to log sql queries. But I still have a few questions regarding this logger.
Where would I need to place this line context.Database.Log = s =>
logger.Log("EFApp", s);?
Can it be globally set? Or do I have to place it everywhere I do DB
operations?
In the "Failed execution" section, the blogger wrote that, and I
quote:
For commands that fail by throwing an exception, the output contains the message from the exception.
Will this be logged too if I don't use the context.Database.Log?
Whenever you want the context to start logging.
It appears to be done on the context object so it should be done every time you create a new context. You could add this line of code in your constructor though to ensure that it is always enabled.
It will not log if you do not enable the logging.
I don't recommend to use that's functionality, because, it hasn't reason to exists in the real case.
Thats it use a lot of to debug code only. But, wether you wanna know more than details ... access link... https://cmatskas.com/logging-and-tracing-with-entity-framework-6/
In this case you can put code like this
public void Mylog()
{
//Thats a delegate where you can set this property to log using
//delegate type Action, see the code below
context.Database.Log = k=>Console.Write("Any query SQL")
//Or
context.Database.Log = k=>Test("Any query SQL")
}
public void Test(string x){
Console.Write(x)
}
I hope thats useufull
I'm using a TransactionalEditingDomain to manage changes on my model. However, I have some problems in creating an empty model. I think that the problem is when I add the model to the model Resource (modelResource.getContents().add(model);), because it should be put within a transaction. Accordingly, I was trying to use the AddCommand to perform such operation, but I am not able to find a EStructuralFeature for the Resource's contents.
In other words, I would like to write something like:
Command cmd = AddCommand.create(editingDomain, modelResource, FEAT_CONTENTS, model);
commandStack.execute(cmd);
The problem is that I cannot find the FEAT_CONTENTS... does anybody have a suggestion?
I have found the "official" solution with using AddCommand on the Eclipse Forum of EMF:
Command cmd = new AddCommand(editingDomain, modelResource.getContents(), model);
commandStack.execute(cmd);
Since removing a root object is also non-trivial, the same approach can be used with RemoveCommand:
Command cmd = new RemoveCommand(editingDomain, modelResource.getContents(), model);
Finally, for completeness, you should also know that DeleteCommand (that also removes all references to the removed object) does not work on root objects at all.
I found a solution, but sincerely I do not like it:
commandStack.execute(new RecordingCommand(editingDomain) {
protected void doExecute() {
modelResource.getContents().add(model);
}
});
I'm developing a Plone Product that needs to import objects programmatically previously exported to ZEXP files. It's working perfectly, except the navigation bar. When one object is imported, it does so correctly, but the navication bar is not updated. The object can be accessed through it's URL and it's parent container contents tab.
Bellow is the code I used to import the objects. It's based on zope's ObjectManager._importObjectFromFile implementation.
def importDocument( app, fileName, container ):
app._p_jar.sync()
owner = 1
connection = container._p_jar
ob = connection.importFile( config.REMOTE_DIR + fileName, customImporters={ magic: importXML, } )
id = ob.id
if hasattr(id, 'im_func'): id = id()
try:
container._setObject( id, ob, set_owner = owner, suppress_events=False )
except AttributeError:
print "AttributeError"
# Try to make ownership implicit if possible in the context
# that the object was imported into
ob = container._getOb( id )
ob.manage_changeOwnershipType( explicit = 0 )
transaction.commit()
return True
I've noticed that the _setObject implementation fires an ObjectAddedEvent event in it's code, and it's after that event that the menu gets updated when I use the ZMI interface to import an object, so I figure something is listening to this event and handling the menu, but oddly, it doesn't happen when using my code.
Generally speaking, importing zexp objects is not supported (in part due to cases like this where unexpected or unintended results may occur). If it works, great. If it doesn't, you are "on your own" and probably better off copying the Data.fs file to a new software stack.
That said, I'm not sure I understand why clear and rebuild the catalog (ZMI -> portal_catalog -> tab 'advance' -> 'clear & rebuild') is not the answer here. According to its description its job is to "walk the entire portal looking for content objects which should be indexed in the catalog and index them".
Unless I misunderstand, you've just described a situation where newly imported content "should be indexed" because it hasn't been indexed yet.
If you are worried about the length of time required to clear and rebuild, try running it from the command line with something like this:
http://svn.plone.org/svn/plone/plone.org/Products.PloneOrg/trunk/scripts/catalog_rebuild.py
If you are worried about crawling the whole site, then call indexObject() on each object (http://dev.plone.org/plone/browser/plone.org/Products.PloneOrg/trunk/scripts/catalog_rebuild.py#L109)
Maybe try manually rebuilding the whole catalog after the import is complete? It might give you more hints to what is wrong ...
ZMI -> portal_catalog -> tab 'advance' -> 'clear & rebuild'.
You may need to "publish" the object after import to make it visible.
Use the manage_importObject method instead.
I am using Eclipse with the Drools plugin to create rules.
I want to create business rules and main aim is to try and provide the user a set of options which he can use to create rules.
For eg:If an Apple can have only 3 colors: I want to provide an option like a drop down so that the user can know before hand which are the options he can use in his rules.
Is it possible?
I am creating a dsl but unable to still provide the above functionality for a business rule.
I am having an error implementing a basic dsl also.
The code to add the dsl is as follows in my RuleRunner class()
InputStream ruleSource = RuleRunner.class.getClassLoader().getResourceAsStream("/Rule1.dslr");
InputStream dslSource = RuleRunner.class.getClassLoader().getResourceAsStream("/sample-dsl.dsl");
//Load the rules , using DSL
addRulesToThisPackage.addPackageFromDrl(
new InputStreamReader(ruleSource),new InputStreamReader(dslSource));
I have both the sample-dsl .dsl and Rule1.dslr in my working directory.
Error encountered at adding the dsl to the package (last line)
Error stack:
Exception in thread "main" java.lang.NullPointerException
at java.io.Reader.<init>(Unknown Source)
at java.io.InputStreamReader.<init>(Unknown Source)
at com.org.RuleRunner.loadRuleFile(RuleRunner.java:96)
at com.org.RuleRunner.loadRules(RuleRunner.java:48)
at com.org.RuleRunner.runStatelessRules(RuleRunner.java:109)
at com.org.RulesTest.main(RulesTest.java:41)
my dsl file has basic mapping as per the online documentations.
The dsl rule I created is:
expander sample-dsl.dsl
rule "A status changes B status"
when
There is an A
- has an address
There is a B
- has name
then
- print updated A and Aaddress
End
I have created DSL in eclipse.
Is the code I added for it to be loaded to my package correct?? Or am I missing something????
It seems like my program is unable to find the dsl?
Please help. Can you point me towards the right direction to create a user friendly business rule ??
Thanks.
J
I am not quite familiar with the method you are trying to use to create a knowledge session, but I will show a example of what's used in my applications.
KnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase(<KnowledgeBaseConfiguration>);
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory.newClassPathResource( "rules/myRuleFile.drl", getClass() ),
ResourceType.DRL );
kbuilder.add( ResourceFactory.newClassPathResource( "rules/myDslFile.dsl", getClass() ),
ResourceType.DSL );
if ( kbuilder.hasErrors() ) {
System.err.println( builder.getErrors().toString() );
}
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
Now as far as giving your users the ability to author rule files, with built in constraints, have you looked at Drools Guvnor?(http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-guvnor/html_single/index.html) I have not incorporated it into my project yet, but have researched it a bit. I think it may provide the functionality your seeking for allowing your users to create and edit rule files. Good luck!